Tall grasses in the San Joaquin valley in California suck carbon dioxide out of the air and store it in the soil. It's one option that environmentalists are pursuing for greenhouse gas "offsets" that can be bought and sold in the state.
Christopher Joyce/NPR
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Riad al-Asaad says he's the leader of the Free Syrian Army, a group of Syrian defectors who recently posted this video on the group's Facebook page.
Free Syrian Army/AP
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After J.C. Penney advertised a shirt many people found sexist, Lauren Todd launched an online petition. This screengrab was taken from Change.org, after J.C. Penney removed the shirt from its inventory.
Change.org
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George Allen, a former U.S. senator and Virginia governor, speaks to employees of an auto parts manufacturing plant near Roanoke, Va., on Oct. 5. Allen is trying to recapture the Senate seat he lost in 2006.
Stephanie Klein-Davis/AP
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Occupy Wall Street protesters meditate while a sign bearing their Twitter hashtag hangs from a railing in Zuccotti Park in October. Some activists accused Twitter of censorship because #OccupyWallStreet wasn't appearing on trending lists.
Jessica Rinaldi/Reuters/Landov
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The Marching 100, Florida A&M University's band, performs on the field before Super Bowl XLIV, Feb. 7, 2010. The band's director, Julian White, was fired in November after a band member died, allegedly from a hazing incident on a bus.
Win McNamee/Getty Images
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